dobyne



3 Sheets -Sheet 1,

(No Model.)

J. B. DOBYNE. FEEDING MEGHANISM FOR SEWING MACHINES.

No. 566,286. Patented Aug. 18, 1896.

3 Sheets-Sheet 2.

J. B. DOBYNE.

(No Model.)

FEEDING MECHANISM FOR SEWING MAGHINES.

Patented Aug. 18, 1896.

HUI WIN].

"W I MIN MUM! WHHM IH MID -v Jay 636 0 w.

(No Model.)

1 3 sheets sheet 3 J. B. DOBYNE. FEEDING MECHANISM FOR. SEWING MACHINES.No. 566,286.

PatentedAug. 18, 1896.

JAMES B. DOBYNE, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE LANDIS \VAXTHREAD SEl/VING MACHINE COMPANY, OF SAME PLACE.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 566,286, dated August18, 1896.

Application filed May 15, 1895. Renewed Tune 18, 1896- Serial No.596,086. (No model.)

To all whom it may concern.-

Be it known that I, JAMES B. DOBYNE, a citizen of the United States,residing at St. Louis, in the State of Missouri, have invented certainnew and useful Improvements in Feeding Mechanism for SewingMachines; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to an improved feedregulating attachment; and itconsists in certain novel features in the construction, arrangement, andoperation of the several parts, as will be hereinafter set forth.

In the drawings, Figure 1 is a front elevation of a machine embodying myimproved features; Fig. 2, a rear elevation; Fig. 3, a plan section online 3, Fig. 1; Fig. 4, a vertical section on line 4, Fig. 3, looking inthe direction indicated by the arrow, showing the feed-lever cam-wheelin elevation; Fig. 5, a vertical section on line 5, Fig. 3, showing theforked or bifurcated feed-lever in part with details; Fig. 6, a sectionon line 6, Fig. 3, showing the lower feed-dog in elevation; and Fig. 7,a broken-away detail.

A is the supporting-base; A, the stationary overhanging arm; A theneedle-lever; A the needle-bar; A the needle; A the combined needle-camand fly-wheel, and B the driving-shaft.

The forked feed-lever O is supported between adjustable pivot-bolts a aand is adapted to have a vibratory movement in a horizontal plane. Thesepivots or bearingbolts have an adjustable threaded engagement in lugs aa, one of which is formed on the overhanging arm and the other on thesupporting-base, as shown more particularly in Figs. 2 and 5. Thefeed-lever is provided with the rear extension a on the top of which ismounted an auxiliary lever a attached thereto by means of a pivot-pinor. The outer end of this lever, Fig. 5, has a frictionroller ajournaled therein. A feed-lever cam-wheel O is rigidly mounted on thedriving-shaft and is provided with a raised camsurface a, Fig. 4, withwhich the frictionroller 0. of lever a is adapted to have a frictionalcontact once in each revolution of the Wheel, and thereby imparting therequired vibratory action to the feed-lever.

The adjustment or throw of the fee-d-lever is varied by a heavy or lightcontact of the lever 11 with the cam-surface a, for the purpose oflengthening or shortening the stitch. This heavy or light contact isregulated by means of a screw-rod D, extending through the base to thefront side of the machine, so as to be within convenient reach of theoperator. This rod is inserted loosely in the base part and passesthrough the rear end of the feed-lever and has a threaded engagementtherein. The rear end of this rod is inserted loosely through the innerend of lever a Figs. 2 and 3, and has a collar 0. fixed thereon. Thebearing-surface of this collar is provided with a series of ratchetliketeeth I), engaging with a rib b, which will prevent the rod from turningaccidentally, when once set, by the jar or vibration of the machine, butwill readily permit of its being turned or adjusted by hand.

The spring 11 coiled 0n the rod, serves to hold the end of the lever aup against the ratchet-collar a A portion of a spring 12 is coiledaround a supporting-bolt 6 inserted in lugs 19 Fig. 5, formed in thebase part. The loose end of this spring bears against a post 19, fixedin the rear extension a of the feed-lever, and serves to return thelatter to its normal position and bring the roller end of lever a backin the pathway of the cam each time after the said cam shall have passedout of contact.

The back end of the lower feed-dog d, Fig. 6, is connected to the lowerfork end d of the feed-lever by means of a pin 61 seated looselytherein, as shown.

The work-plate d retains the lower feeddog in its place and allows avibratory or endwise movement thereof.

Alink g is mounted on the upper fork end 9 ment the action of thefeed-lever is positive,

and the movement of the lower and upper feed-dog is always in unison.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a sewing-machine, the combination with a forked feed-lever adaptedto have a vibratory movement in a horizontal plane and provided with arear extension, an auxiliary lever, pivotally mounted 011 top of saidrear extension, and a rotating cam-wheel, with which the rear end ofsaid auxiliary lever is adapted to have contact, substantially asdescribed.

2. In a sewing-machine, the combination with a forked feed-lever,pivotally mounted and adapted to have a vibratory movement in ahorizontal plane, an auxiliary lever, pivotally mounted on the rear endof the feedlever, a cam-wheel, adapted to have an intermittent contactwith the rear end of said auxiliary lever, the driving-shaft, mountingsaid cam-wheel, an adjusting screw-rod, in-

. serted through and having a threaded engagement in the feed-lever andpassing loosely through the inner end of said auxiliary lever, a collar,fixed on the back end of said rod and bearing against the adjacentsurface of the auxiliary lever, and a spring, coiled on said rod,substantially as described.

3. In a sewing-machine, the combination with a forked feed-lever, of anauxiliary lever, pivotally mounted on the rear part of the feed-lever,an adjusting screw-rod, inserted through said feed-lever and auxiliarylever, a collar, mounted on the back end of said rod, and a spring,coiled on said rod between the feed and auxiliary levers, substantiallyas described.

4. In a sewing-machine, the combination with the forked feed-leverconnected to the presser-foot and lower feed-dog and adapted to have avibratory movement in a horizontal plane, of an auxiliary leveradjustably and yieldingly connected to said forked lever, means foradjusting said auxiliary lever relatively to the forked lever, and meansfor actuating said auxiliary lever, all combined substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES B. DOBYNE. \Vitnesses:

L. M. FREEMAN, L. B. COUPLAND.

